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Old 20th January 2005, 04:04 AM   #1
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Join Date: Jul 2004
Location: Bangok
Smile E-Follower & P37 By Rod -- It's cool.

I just finished my amp .
E-Follower (by Pavel Macura) drive with Pre (DoZ) P37 By Rod Elliott .

I use IRFP450 & TIP142. (because l have it. )
Input 1.5/160 WIMA MKP
parallel 4700/50V with 1.5/160 WIMA MKP
Power supply 35 VDC

Pre (DoZ) P37 By Rod Elliott .
Input 1.5/160 WIMA MKP
Power supply 38 VDC

I try direct coupling between Pre & Amp umm.. not difference

It's run hot.
but sound wonderful , very great . and cheap.
many thanks pavel , Rod.
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Old 20th January 2005, 09:37 AM   #2
4real is offline 4real  Netherlands
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Location: Arnhem
Well, thaks seems to look nice.

I was planing on using the follower, too, but with an opamp and not the IRF's. Still not sure about it though...

What kind of a PSU did you use?

Can you compare this one with other class A designs?
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Old 21st January 2005, 02:40 AM   #3
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Join Date: Jul 2004
Location: Bangok
Hello ,

I use simple PSU (per channel)

For power amp
EI Transformer 28-0 VAC 150 VA
Bridge 25 A
C Elna 10000/50 x4

O transformer 36-0 VAC 30 VA
regulated with zener 36V & BD139

my camera just borrowed ,
I will post picture soon..

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Old 21st January 2005, 10:43 AM   #4
PMA is offline PMA  Europe
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Location: Prague
Some of the readers have small troubles with achieving appropriate Iq through R6 (1 Ohm). This is caused by the different ZD3V zener diodes than I use. I strongly recommend for this position the BZX83 3V0 zener diode (0.6W). The bigger diodes have smoother knee of the reverse characteristics, their zener voltage is usually too low in this circuit, resulting in too low Iq. This can be easily measured as a voltage drop across R6.

Another comment is about direct coupling berween the DoZ pre and the follower. This way you lose output power, as there is a 4V voltage shift at MOSFET gate against DoZ output. Both the DoZ dc output voltage and MOSFET Source output voltage should be at +Vs/2 for the highest possible output power. The only way how to get it is to use the coupling capacitor and bias resistor at MOSFET gate, as seen on my web.

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Old 24th January 2005, 03:19 AM   #5
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Location: Bangok
Many thanks ,Pavel.

I 'll try to test.

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